Renesas 70V9389L9PRFI8

Overview

70V9389L9PRFI8 from IDT (now Renesas) is a high-speed, 3.3V synchronous dual-port static RAM with true dual-ported 64K × 18-bit memory array, pipelined/flow-through output modes, and industrial temperature support (–40°C to +85°C). It delivers 12 ns cycle time at 83 MHz in pipelined mode, consumes 180 mA typical active current, and supports simultaneous read/write access on independent left/right ports - used in real-time DSP inter-processor communication and FPGA co-processor buffering.

For engineers reviewing the 70V9389L9PRFI8 datasheet, 70V9389L9PRFI8 pinout, 70V9389L9PRFI8 application, or 70V9389L9PRFI8 equivalent, key selection criteria include pipelined vs. flow-through timing control, dual chip enable depth expansion capability, LVTTL-compatible 3.3V operation, and industrial-grade thermal reliability for embedded control systems.

Technical Context

The 70V9389L9PRFI8 implements fully synchronous dual-port architecture with clocked address, data, and control registers on both ports - requiring only 4 ns setup and 0 ns hold on all inputs. Its self-timed write pulse decouples internal write completion from clock edge timing, enabling minimal cycle time.

It features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) controls per port, dual address strobe (ADSL/ADSR) and counter enable/reset (CNTENL/CNTRSTL, CNTENR/CNTRSTR) signals, and configurable FT/PIPE pins that determine whether outputs operate in flow-through (20 ns max tCD1) or pipelined (9 ns max tCD2) mode - directly impacting latency-critical buffer designs.

Key Specifications

Pinout & Package

70V9389L9PRFI8 is packaged in a 128-pin Thin Quad Flatpack (TQFP) with 14 mm × 20 mm body and 0.4 mm pitch. All VDD (pins 20, 49, 65, 70, 84, 94, 101, 112, 120) and VSS (pins 19, 48, 64, 69, 83, 93, 100, 111, 119) pins require proper decoupling per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C028V-15AXC and AS7C362000B-12JIN, the 70V9389L9PRFI8 uniquely delivers true simultaneous port access, programmable pipelined latency, and integrated address counter - making it optimal for tightly coupled real-time subsystems where determinism and minimal software overhead are essential.

Availability

70V9389L9PRFI8 is available at Aetrix Electronics and suitable for industrial motion control, real-time DSP inter-processor communication, and FPGA co-processor buffering requiring stable component supply and long-term obsolescence mitigation.

Supply support for 70V9389L9PRFI8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

IDT (Integrated Device Technology), now part of Renesas Electronics, is a semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V9389L9PRFI8 belongs to IDT's high-speed synchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor data exchange in real-time embedded systems.

FAQ

What is the maximum operating frequency of the 70V9389L9PRFI8 in pipelined mode?

The 70V9389L9PRFI8 supports up to 83 MHz operation in pipelined mode, corresponding to a 15 ns maximum clock cycle time (tCYC2) as specified in the industrial-grade AC characteristics table. This frequency assumes proper 3.3V ±0.3V supply, –40°C to +85°C ambient, and compliant load conditions per Figure 1 test setup. The 70V9389L9PRFI8 achieves this performance using registered inputs and self-timed write architecture.

Does the 70V9389L9PRFI8 support simultaneous read and write operations on the same memory location?

Yes, the 70V9389L9PRFI8 implements true dual-ported memory cells that permit simultaneous, independent read and write access to the exact same memory address - one port reading while the other writes - without contention or arbitration logic. This capability is fundamental to its use in real-time inter-processor communication and is verified in the functional block diagram and Truth Table I of the datasheet.

How does the FT/PIPE pin affect timing behavior of the 70V9389L9PRFI8?

The FT/PIPE pin (separate FT/PIPEL and FT/PIPER signals) configures each port's output register behavior: when driven high (VIH), the port operates in pipelined mode with 1-cycle latency and 9 ns max clock-to-data-out (tCD2); when low (VIL), it operates in flow-through mode with zero-cycle latency and 20 ns max tCD1. This selection is independent per port and directly impacts system-level timing budgets and determinism requirements.

What package type and pin count does the 70V9389L9PRFI8 use?

The 70V9389L9PRFI8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package with 0.4 mm lead pitch and a 14 mm × 20 mm body footprint. Pin assignments follow the PK128 package code defined in the datasheet, including dedicated VDD/VSS pairs, dual chip enables per port, and symmetric left/right I/O, address, and control signal allocation.

Can the 70V9389L9PRFI8 be used for depth expansion without external logic?

Yes, the 70V9389L9PRFI8 supports depth expansion using its dual chip enables (CE0 and CE1 per port) as described in Truth Table I and Figure 4 of the datasheet. By configuring CE0 and CE1 appropriately across multiple devices, designers can expand memory depth (e.g., 128K × 18) without additional address decoding logic - a key advantage over single-enable SRAMs. The 70V9389L9PRFI8's CE behavior is explicitly characterized for both single- and double-buffered operation depending on FT/PIPE state.